Squib



Filed July 9I 1925 @mmv Patented Jan. 5, i926.

SATS

ISAAC T. JENKINS, OF TUNKHANNOCK, PENNSYLVANIA.

SQUIB.

Application led July 9, 1925. Serial No. 42,473.

To @ZZ whom t may concern.'

Be it known that I, Isaac T. JENKINS, a citizen of the United States,residing at Tunkhannock, in the county of Wyoming and State ofPennsylvania, have invented certain new and useful Improvements in aSquib, of which the following is a specification.

This invention relates to an improved squib highly adaptable for use byminers for exploding a charge of powder used for disrupting anddislodging coal, rock, and the like.

A common form of squib is a tube of sott reed paper iilled with areadily inflammable powder. The end of the squib adapted to be ignitedis dipped into sulphur or nitre, and a common match or other source ofiame is applied to the treated end to ignite the squib. This, as is wellknown, is dangerous procedure.

In view of the foregoing circumstances, I have conceived of a meanswhereby an electric current may be utilized for igniting the treated endof the squib from a distant point, whereby to relieve the attendant ofthe danger otherwise encountered.

The particular structure employed for accomplishing the end specifiedwill become apparent from the following detailed description takentogether with the accompanying drawings, and the appended claim settingout the alleged improvement.

In the accompanying drawing forming a part of this application and inwhich like numerals are employed to designate lik parts throughout thesame:

Figure 1 is a central longitudinal section cut through the improveddevice.

Fig. 2 is a side elevation of the same, and

Fig. 3 is a cross section taken approximately upon the plane of the line3-3 of Fig. 2.

In the drawings, the reference character l designates the squib. This isof somewhat conventional Jform and comprises the usual tube made fromstraw, reed paper or its equivalent and filled with an appropriate kindoi' explosive powder. The end to be ignited is treated in the usual wayby dipping in sulphur, nitre, or an equivalent material. In accordancewith my idea, however, a novel holder 2 is provided for the squib andthis holder embodies a cylinder 3 having a rectangular opening l on oneside and provided at one end with a cylin- `drical bored extension 5providing a bushlng through which the squib l is inserted.

It is to be noted that the squib is of a length to extend beyond theouter end of the bushing and having its inner end positioned within thecylinder 2:3 and exposed through the side opening in the latter.Arranged within this cylinder is a wire coil G fastened to form a pocketinto which the ignitable end of the squib is extended. This coiledpocket is provided with two take-oil wires 'i' and 8 at its end whichare extended through one end of the cylinder and encased in appropriateinsulation 9. The insulated wires extend to a suitable source otelectric current supply, such as a battery, the same not being shown.

l/Vith the arrangement specilied, it is obvious that when the currentpasses through the wires and pocket forming coil, the latter acts as aresistance and is heated to such an extent as to ignite the end ot thesquib which is fitted into it. The squib being placed in' the wholecontaining the charge, affects the charge-oit' and the explosion occurswhen the attendant or operator is at a remote point. Hence, theoperation is not attended by the usual dangers encountered.

A careful consideration of the description in connection with thedrawings will enable persons skilled in `the art to which the inventionrelates to obtain a clear understanding of the same. Therefore a morelengthy description is thought unnecessary.

lVhile the preferred embodiment of the invention has been shown anddescribed, it is to be understood that minor changes coming within thefield of invention claimed may be resorted to iia desired.

Having thus described my invention, what I claim as new is A device ot'the class described comprising a hollow cylinder having an elongatedopening on one side and an open ended tubular extension at one end, asquib litted into and extending through said extension with its innerend located in said cylinder, and a resistance coil supported in saidcylinder, the coil being formulated to provide a pocket for receptionfor the inner end of said squib. y a

In testimony whereof I aiix my signature.

ISAAC T.- JENKINS.

